为了对低频超宽带合成孔径雷达 (SAR)实施有效的图像欺骗干扰, 提出基于卷积技术的欺骗干扰方法。基于 SAR目标回波特性, 推导了干扰调制函数解析式。在产生干扰信号时, 需要对解析式进行近似处理, 针对低频超宽带 SAR二维强耦合特性以及超宽带 SAR成像处理算法, 将干扰调制函数精确到三次相位项, 并对各级系数进行分析和简化处理。最后通过仿真实例验证了对干扰产生函数改进的必要性及干扰的有效性。理论分析和仿真结果均表明, 改进后的干扰方法可以对超宽带 SAR实施有效的图像欺骗干扰。

A deceptive jamming method based on convolution technique is proposed in order to implement effective image deception jamming for low frequency ultra wideband Synthetic Aperture Radar(SAR). Based on the SAR target echo characteristic, analytic formula of the modulation function is derived. The approximate processing is required when the jamming signal generated. For a low frequency ultra wideband SAR, the echo signal is strongly coupled because of the wide beam. Considering the usual imaging algorithm used in ultra wideband SAR, the jamming modulation function is accurate to the cubic phase. And the coefficients of each term are analyzed and simplified. Finally, two simulation examples are given to show the necessity of improvement and the effectiveness of the jamming technology. Both the theoretical analysis and simulation results show that the improved method can effectively implement the false image jamming for ultra wide band SAR.